    .spinner 
        height 100px
        width 100px
        margin 100px auto
        text-align center
        font-size 10px
    
    .spinner > div 
        display inline-block
        width 10px
        height 100%
        background-color rgb(43,128,226)
        margin-right 1px
        animation bytedance 1s infinite
    
    @keyframes bytedance 
        0%,40%,100% 
            transform scaleY(0.4)
        
        20% 
            transform scaleY(1)
        
        
    for num in (2..5)
        .spinner > div:nth-child({num}) {
            animation-delay: (-1.1 + num * 0.1)s;
        }

